Rosemount OCX 8800, Instruction Manual

Page: 73 / 266

Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
Section 5 Calibration
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5-1
Fully Automatic Calibration . . . . . . . . . . . . . . . . . . . . . . . . page 5-1
Operator - Initiated Autocalibration . . . . . . . . . . . . . . . . . page 5-3
Manual Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5-4
D/A Trim Procedures - LOI . . . . . . . . . . . . . . . . . . . . . . . . . page 5-12
D/A Trim Procedures - HART . . . . . . . . . . . . . . . . . . . . . . . page 5-14
OVERVIEW
During a calibration, two calibration gases with known O
2
concentrations and
one calibration gas with a known COe concentration are applied to the OCX
8800. Slope and constant values are calculated to determine if the OCX 8800
is correctly measuring net concentrations of O
2
and combustibles in the
industrial process.
Before calibrating the OCX 8800, verify that the calibration gas parameters
are correct by setting the test gas values used when calibrating the unit. Refer
to Section 3, Configuration and Startup.
There are three calibration methods available to the OCX 8800; automatic,
operator-initiated automatic, and manual. Calibration commands and menus
can be accessed by 375 Field Communicator or by the optional LOI.
FULLY AUTOMATIC
CALIBRATION
If the OCX 8800 is equipped with calibration solenoids, the unit can be
programmed to automatically calibrate without any operator action. Refer to
the following paragraphs for using the LOI or 375 Field Communicator to set
up the OCX 8800 for fully automatic calibration.
Autocalibration Setup using the optional LOI
Use the following procedure to set up the OCX 8800 for automatic calibration.
If necessary, use the LOI menu tree in Figure 4-4 for reference. The unit must
be equipped with calibration solenoids to use automatic calibration.
NOTE
Automatic calibration is only available on units equipped with calibration
solenoids.
1. From the operating display use the right-pointing key to select SYSTEM
first column submenu.
2. From the SYSTEM first column submenu, use the right-pointing key to
select the Calib Setup second column submenu.
3. From the Calib Setup second column submenu, use the right-pointing
key to select the third column parameter list.